Why are cities often built in valleys instead of on mountains?

Question

Why are cities often built in valleys instead of on mountains?

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Answer 1

Valleys are where water runs. You need water for drinking, cooking, washing, irrigation, watering animals, fishing, and transportation. Water runs away from mountains and into valleys.

Valleys are where roads run. No one wants to climbs a mountain to get to your village. The easy route that the water takes is the easy route that the roads take. Roads run around mountains, not over them.

Valleys are where soil collects. Soil erodes from the mountains into the valleys, and from upstream to downstream. You need good soil for growing crops.